CP Filters on Oly 14-42 MSC?

Anybody using a polarizer on this lens? I'm thinking about investing a chunk of change in a B+W CP for it, but am concerned about vignetting at (and near) the wide end. Would welcome all comments / suggestions from anyone with experience using filters on this lens.

I got the cheapest cp I could find on Amazon to use disposably for a beach vacation. I didn't get any vignetting whatsoever. (I was not using any other filters, however.). I suspect you'll be fine whatever you pick.